CN113770480A - Cutting method of carbon steel and stainless steel composite material - Google Patents
Cutting method of carbon steel and stainless steel composite material Download PDFInfo
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- CN113770480A CN113770480A CN202111141562.4A CN202111141562A CN113770480A CN 113770480 A CN113770480 A CN 113770480A CN 202111141562 A CN202111141562 A CN 202111141562A CN 113770480 A CN113770480 A CN 113770480A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/008—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
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Abstract
The invention discloses a cutting method of a carbon steel and stainless steel composite material, the carbon steel and stainless steel composite material comprises a carbon steel layer and a stainless steel surfacing layer, the height of the carbon steel layer is more than or equal to 100mm, the thickness of the stainless steel surfacing layer is more than 10mm and less than or equal to 150mm, and the cutting method comprises the following steps: placing the carbon steel layer and the stainless steel surfacing layer along the vertical direction; arranging a flame cutting gun and a plasma cutting gun, wherein a cutting nozzle of the flame cutting gun is vertically downward, and a cutting nozzle of the plasma cutting gun is horizontally arranged and faces the stainless steel surfacing layer; and cutting the carbon steel layer by using the flame cutting gun, and cutting the stainless steel surfacing layer by using the plasma cutting gun so as to finish the cutting of the carbon steel and stainless steel composite material.
Description
Technical Field
The invention belongs to the technical field of metal cutting, and particularly relates to a cutting method suitable for carbon steel and stainless steel composite materials.
Background
Industrial mature cutting processes for thick large pieces of steel (thickness >100mm) typically include flame cutting, mechanical cutting, water cutting, plasma cutting, and the like. The flame cutting has the largest thickness and the fastest speed, but is only suitable for carbon steel parts. The plasma cutting process belongs to thermal cutting, but the stable cutting thickness of the plasma cutting process only reaches 150 mm. Water jet cutting and mechanical cutting are cold cutting, the cutting rate is relatively slow, and the cutting equipment is higher in cost and more complex than the same flame cutting equipment. Table 1 lists the process comparisons for cutting thick large parts by 4 cutting methods.
TABLE 1 comparative analysis of flame cutting, mechanical cutting, water cutting and plasma cutting
| Serial number | Cutting process | Thickness (mm) | Speed (mm/min) | Cutting material suitable for use |
| 1 | Flame cutting | ≤3000 | 24-600 | |
| 2 | Water jet cutting | ≤800 | 1.5-2 | Carbon steel, |
| 3 | Mechanical cutting | ≤1000 | 0.6-15 | Carbon steel, |
| 4 | Plasma cutting | ≤150 | 2-200 | Carbon steel, stainless steel |
From a comparison of the above 4 cutting processes, flame cutting has a very significant advantage in terms of cut thickness and cut rate. Therefore, in the industry at present, the flame cutting method is generally directly adopted to cut thick and large carbon steel plates.
The mechanism of flame cutting is to burn the metal and use a high velocity gas stream to blow off the metal combustion. The flame cutting process mainly uses high-purity and high-flow-rate oxygen to react with preheated steel to generate iron oxide and release a large amount of heat. The combustion heat melts combustion products and part of iron nearby into liquid to form slag, meanwhile, the slag is blown away from steel by high-speed oxygen flow, the steel nearby the cut is preheated to a temperature above a burning point due to heat conduction in the process, and the slag is blown off and then continuously reacts with high-purity oxygen, so that the cutting process is maintained, and the iron blocks are cut.
Flame cutting has its application range, however, requiring that the melting point of the metal oxide to be cut is not higher than that of the metal. For example, the melting point of metal oxides of metals such as chromium, nickel, aluminum, zinc and the like is higher than the melting point of the metals, the metal oxidation products are difficult to melt by simply relying on heat generated by flame, and the oxides are covered on the metal surface in a solid state to influence the subsequent combustion process, so that the cutting is difficult to maintain.
The carbon steel (including low carbon steel and high carbon steel) has low alloy content, the melting point of metal oxide is generally lower than that of metal, and flame cutting can be applied. Stainless steel generally contains about 30% of alloy elements, such as Cr, Ni, Al, Zn and the like, and the melting point of oxides of the alloy elements is far higher than that of metal, so flame cutting cannot be directly applied to cutting a stainless steel plate.
For a stainless steel plate, an iron powder combustion improver and flame cutting mode is generally adopted in the prior art, namely, iron powder is fed into flame by using an external device, and a large amount of heat is generated by burning the iron powder to melt alloy oxides, so that the problem that the pure gas is insufficient in combustion heat value to melt the oxides is solved. But the splashing of the combustion-supporting flame cutting of the iron powder is serious and the pollution degree to the environment is high.
The carbon steel part with the stainless steel opposite welding layer is a carbon steel and stainless steel composite part, a common flame cutting mode cannot be applied generally, and the carbon steel part must be cut by adopting an iron powder combustion improver and a flame cutting method.
At present, a large number of carbon steel part cutting demand scenes with stainless steel overlaying layers exist in the industry, such as metal equipment in nuclear power decommissioning. In consideration of corrosion resistance, the main equipment of the nuclear power static machinery is generally designed into an inner-layer butt-welded stainless steel + carbon steel main structure, such as large-scale main equipment of a nuclear reactor pressure vessel, a steam generator and the like, the thickness of main carbon steel of the main equipment is generally more than 150mm, and the main carbon steel belongs to an ultra-thick part; the thickness of the stainless steel weld overlay is typically within 10 mm. After the primary equipment is retired, cutting, space occupation reduction and waste disposal volume reduction are needed. If the combustion-supporting flame cutting of iron powder is adopted, a large amount of radioactive impurities are inevitably splashed and serious air pollution is caused.
Disclosure of Invention
In view of the above, in order to overcome the drawbacks of the prior art, the object of the present invention is to provide an improved cutting method which can be used for cutting a composite material formed of carbon steel and stainless steel, the main carbon steel of which has a thickness of 100mm or more.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cutting method of a carbon steel and stainless steel composite material, the carbon steel and stainless steel composite material comprises a carbon steel layer and a stainless steel overlaying layer, the height of the carbon steel layer is greater than or equal to 100mm, the thickness of the stainless steel overlaying layer is greater than 10mm and less than or equal to 150mm, and the cutting method comprises the following steps: placing the carbon steel layer and the stainless steel surfacing layer along the vertical direction; arranging a flame cutting gun and a plasma cutting gun, wherein a cutting nozzle of the flame cutting gun is vertically downward, and a cutting nozzle of the plasma cutting gun is horizontally arranged and faces the stainless steel surfacing layer; and cutting the carbon steel layer by using the flame cutting gun, and cutting the stainless steel surfacing layer by using the plasma cutting gun so as to finish the cutting of the carbon steel and stainless steel composite material.
According to some preferred embodiments of the present invention, when cutting, the cutting surface (cutting path, cutting slit) of the carbon steel layer and the cutting surface of the stainless steel weld overlay are located on the same plane.
According to some preferred embodiments of the present invention, the cutting is performed by cutting the carbon steel layer, and after the cutting of the carbon steel layer is completed, the cutting of the stainless steel overlay layer is performed. The stainless steel slag is blown off by high-speed airflow and blown away from the carbon steel piece slot, so that the blockage of the slag is avoided.
According to some preferred embodiments of the present invention, the higher the height of the carbon steel layer is, the slower the moving rate (cutting rate) of the torch is; the thicker the thickness of the stainless steel overlay, the slower the movement rate (cutting rate) of the plasma torch. The thicker the metal thickness, the more heat is required to burn or melt the metal and therefore the lower the thermal cutting rate, so that the flame stream stays longer at the slot, allowing more heat to be transferred to the metal in the cutting path and slot. Conversely, the thinner the metal, the lower the heat required to cut through the metal, and the faster the torch travel rate. The cutting rate is too high, which can cause poor cutting quality, such as edge hanging, partial cutting and no penetration; too low a cutting rate may result in widening of the slit and waste of raw material.
According to some preferred implementation aspects of the invention, the distance between the cutting nozzle of the flame cutting gun and the carbon steel layer is 4-8 mm; the distance between the cutting nozzle of the plasma cutting gun and the stainless steel surfacing layer is 2-6 mm. The too long distance can cause the defects of too large cutting power consumption, partial cutting failure and the like; the phenomenon of hanging edges, widening a cutting seam and the like can occur due to the excessively short distance, so that the cutting quality is poor, and raw materials are wasted. The above distance setting combines good cutting quality with acceptable cutting rate. The above distance setting combines good cutting quality with acceptable cutting rate.
The invention also provides another cutting method of the carbon steel and stainless steel composite material, the carbon steel and stainless steel composite material comprises a carbon steel layer and a stainless steel resurfacing welding layer, the thickness of the carbon steel layer is more than or equal to 100mm, the thickness of the stainless steel resurfacing welding layer is less than or equal to 10mm, and the cutting method comprises the following steps: placing the carbon steel layer and the stainless steel surfacing layer along the horizontal direction, wherein the carbon steel layer is positioned above the carbon steel layer, and the stainless steel surfacing layer is positioned below the carbon steel layer; arranging a flame cutting gun, so that a cutting nozzle of the flame cutting gun is vertically downward; and cutting the carbon steel layer by using the flame cutting gun.
According to some preferred embodiments of the present invention, the cutting surface of the carbon steel layer, the cutting path, and the cutting seam) and the cutting surface of the stainless steel weld overlay are located on the same plane.
According to some preferred embodiments of the present invention, the thicker the thickness of the carbon steel layer is, the slower the moving rate (cutting rate) of the torch is.
According to some preferred implementation aspects of the invention, the distance between the cutting nozzle of the flame cutting gun and the carbon steel layer is 4-8 mm. The too long distance can cause the defects of too large cutting power consumption, partial cutting failure and the like; the phenomenon of hanging edges, widening a cutting seam and the like can occur due to the excessively short distance, so that the cutting quality is poor, and raw materials are wasted. The above distance setting combines good cutting quality with acceptable cutting rate.
According to some preferred aspects of the invention, the thicker the stainless steel weld overlay, the thicker the corresponding carbon steel layer. The lower stainless steel weld overlay is melted by the large heat generated by the combustion of the carbon steel in the flame. The thicker the carbon steel layer is, the greater the combustion heat of the carbon steel layer is, and the easier the lower stainless steel overlaying layer is melted; the thicker the stainless steel weld overlay, the more heat required for melting, and the greater the thickness of carbon steel layer required.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: according to the cutting method of the carbon steel and stainless steel composite material, when the thickness of the stainless steel layer is thicker, a composite cutting method combining plasma cutting and flame cutting is adopted; when the thickness of the stainless steel layer is thinner, a pure flame cutting method is adopted, and the placing mode of a sample to be cut is matched, so that the cutting of the composite material of the carbon steel and the stainless steel is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a first schematic diagram of an edge lift-off process in accordance with a first preferred embodiment of the present invention;
FIG. 2 is a second schematic diagram of an edge lift-off process in accordance with a first preferred embodiment of the present invention;
FIG. 3 is a third schematic view of an edge skiving process in accordance with a preferred embodiment of the present invention;
FIG. 4 is a first schematic diagram of a center piercing cutting method according to a first preferred embodiment of the present invention;
FIG. 5 is a second schematic diagram of a center piercing cutting method according to a first preferred embodiment of the present invention;
FIG. 6 is a third schematic diagram of a center piercing cutting method according to a first preferred embodiment of the present invention;
FIG. 7 is a first schematic diagram of a cutting method according to a second preferred embodiment of the present invention;
FIG. 8 is a second schematic diagram of a second cutting method according to a second preferred embodiment of the present invention;
FIG. 9 is a third schematic diagram of a cutting method according to a second preferred embodiment of the present invention;
FIG. 10 is a fourth schematic diagram of a dicing method according to a second preferred embodiment of the present invention;
FIG. 11 is a fifth schematic diagram of a second preferred embodiment of the present invention;
FIG. 12 is a sixth schematic diagram of a cutting method according to a second preferred embodiment of the present invention;
FIG. 13 is a seventh schematic illustration of a cutting method according to a second preferred embodiment of the present invention;
in the attached drawing, a rack-1, a carbon steel layer-2, a stainless steel overlaying layer-3, a flame cutting gun-4 and a plasma cutting gun-5.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a cutting method for cutting a carbon steel part with a stainless steel surfacing layer, which mainly aims at the condition that the thicknesses of the stainless steel surfacing layer and the carbon steel layer are thicker in the nuclear power field. When the thickness of the stainless steel resurfacing welding layer is less than or equal to 10mm, pure flame cutting can be adopted, and the principle is as follows: the lower stainless steel weld overlay is melted by the large heat generated by the combustion of the carbon steel in the flame. The thicker the carbon steel layer is, the larger the combustion heat is, and the easier the stainless steel overlaying layer at the lower part is melted; the thicker the stainless steel weld overlay, the more heat required for melting, and the greater the thickness of carbon steel layer required. When the thickness of the stainless steel overlaying layer is more than 10mm, a composite cutting method combining flame cutting and plasma cutting can be adopted, the advantages of flame and plasma cutting of thick-wall steel pieces are fully utilized, different technological parameters including requirements on metal thickness, height, distance between a cutting nozzle and a cutting plane, cutting speed and the like need to be adjusted for the steel pieces with different thicknesses, specific parameters of the two schemes are shown in the following table, and the matching relation between quantitative cutting thickness and cutting gun moving speed can be seen from the table.
TABLE 2 correlation parameters for different methods
Example A pure flame cutting method for a stainless weld overlay 3 of relatively thin thickness (10 mm or less)
The cutting method in the present embodiment is suitable for a cutting method of a composite material formed of carbon steel and stainless steel, in which the thickness of the stainless steel weld overlay 3 is 10mm or less. According to the different cutting paths, the cutting method is divided into an edge cutting method (as shown in fig. 1-3) and a center perforation cutting method (as shown in fig. 4-6), and the two cutting methods have the same parameters except for the different setting of the paths, and specifically, the following steps are carried out:
1. edge lifting and cutting method
1.1) placing of cutting elements
As shown in fig. 1, a carbon steel member (composite material composed of a carbon steel layer 2 and a stainless steel weld overlay 3) with a stainless steel weld overlay 3 is horizontally laid on a cutting table 1, the carbon steel layer 2 is on the upper part, and the stainless steel weld overlay 3 is on the lower part. The flame cutting gun 4 firstly cuts the carbon steel part in the arrangement mode, a large amount of heat generated by carbon steel combustion melts the stainless steel overlaying layer 3 on the lower part, the flame cutting gun 4 synchronously sends out high-speed airflow to blow off carbon steel and stainless steel slag, and cutting-through is realized. The cutting gun moves according to a set route to realize cutting according to the route. During cutting, the cutting surface (cutting seam) of the carbon steel layer 2 and the cutting surface of the stainless steel resurfacing welding layer 3 are positioned on the same plane.
1.2) arrangement of flame cutting torch 4
As shown in figure 2, a cutting nozzle of the flame cutting gun 4 is controlled to vertically move downwards and move to the edge of the integral workpiece to be cut, and the distance Lt between the cutting torch and the surface of the carbon steel is adjusted to be in a proper range of 4-8 mm.
1.3) cutting
As shown in fig. 3, the flame cutting torch 4 is ignited, and cuts through the carbon steel layer 2 and the stainless steel layer integrally at the edge from top to bottom; the flame cutting torch 4 moves according to the cutting path and cuts to the designated position, and the cutting is finished.
2. Center piercing cutting method
2.1) placing of cutting elements
As shown in fig. 4, a carbon steel member (composite material composed of a carbon steel layer 2 and a stainless steel weld overlay 3) with a stainless steel weld overlay 3 is horizontally laid on the cutting table frame 1, the carbon steel layer 2 is on the upper portion, and the stainless steel weld overlay 3 is on the lower portion. The flame cutting gun 4 firstly cuts the carbon steel part in the arrangement mode, a large amount of heat generated by carbon steel combustion melts the stainless steel overlaying layer 3 on the lower part, the flame cutting gun 4 synchronously sends out high-speed airflow to blow off carbon steel and stainless steel slag, and cutting-through is realized. The cutting gun moves according to a set route to realize cutting according to the route. When cutting, the cutting surface of the carbon steel layer 2 and the cutting surface of the stainless steel resurfacing welding layer 3 are positioned on the same plane.
2.2) arrangement of flame cutting torch 4
As shown in FIG. 5, the cutting nozzle of the flame cutting torch 4 is controlled to vertically face downwards and move to the position to be perforated, and the distance Lt between the cutting torch and the surface of the carbon steel is adjusted to be in a proper range of 4-8 mm.
2.3) cutting
As shown in fig. 6, the flame cutting torch 4 is ignited, the flame continuously heats and burns the carbon steel, the carbon steel burns to generate a large amount of heat to melt the stainless steel overlaying layer 3 at the lower part, and the carbon steel and the stainless steel slag are blown off by high-speed airflow to successfully form a through hole; the flame cutting torch 4 moves along the cutting direction and cuts to a designated position to finish cutting.
The flame cutting can not directly cut the stainless steel, the carbon steel piece and the stainless steel overlaying layer 3 on the surface of the carbon steel piece can be synchronously cut by the flame cutting through the process selection of the placing mode, the distance between the cutting nozzle and the cutting surface, the cutting thickness and the cutting speed, which are provided by the first embodiment, and two cutting path selections are provided by the first embodiment. Example 1 the lower stainless steel weld overlay 3 was melted using the large heat generated by the combustion of carbon steel in a flame. The following cutting rate (moving speed of the cutting torch) was matched for different thicknesses of the stainless steel weld overlay 3 and the carbon steel layer 2.
Example 2 cutting method for stainless steel overlaying layer 3 with thicker thickness (Ds is more than 10 and less than or equal to 150mm)
The method comprises the following steps: cutting member placement
The carbon steel piece (composite material formed by the carbon steel layer 2 and the stainless steel resurfacing welding layer 3) with the stainless steel resurfacing welding layer 3 is vertically placed on the cutting bench 1, and the stainless steel resurfacing welding layer 3 is located on the side face. As shown in fig. 7, the carbon steel substrate layer is on the right side and the stainless steel weld overlay 3 is on the left side. The flame cutting torch 4 and the plasma cutting torch 5 are set in a standby state.
Step two: flame cutting of the main carbon steel layer 2
As shown in fig. 8, the torch 4 is positioned to the point of initial cut as required by the cut path.
And controlling a cutting nozzle of the flame cutting gun 4 to vertically move downwards and move to the position of the starting point required by the cutting path, and adjusting the distance Lt between the cutting torch and the surface of the carbon steel layer 2 to be in a proper range of 4-8 mm.
As shown in fig. 9, the torch 4 is fired to cut through the carbon steel layer 2 from the top to the bottom at the starting point.
As shown in fig. 10, the flame cutting torch 4 moves along the path, and the cutting of the carbon steel layer 2 is completed from right to left.
Step three: plasma cutting stainless steel weld overlay 3
After the carbon steel layer 2 is cut, a plasma cutting torch 5 is horizontally arranged, a torch head of the plasma cutting torch is aligned with a cutting seam of flame cutting, the torch head is moved to the position of the starting point of a stainless steel cutting path, and the distance Ls from the cutting torch to the surface of the stainless steel is adjusted to be 2-6mm, as shown in fig. 11.
As shown in figure 12, the plasma cutting torch 5 is ignited at the starting point position and cuts through stainless steel, and stainless steel slag is blown off by high-speed airflow and blown away from the carbon steel part cutting seam, so that the slag blockage is avoided.
As shown in fig. 13, the plasma cutting torch 5 moves along a path (from top to bottom) to cut the stainless steel build-up layer 3, and then the carbon steel and stainless steel composite material is cut.
The single flame cutting process cannot directly cut the stainless steel, and the single plasma cutting process cannot cut steel pieces with the thickness of more than 150mm, but the arrangement mode, the distance between the cutting nozzle and the cutting surface, the cutting path and the cutting thickness selection provided by the embodiment can realize the cutting of the large and thick carbon steel and the stainless steel overlaying layer 3 on the surface by using the flame and plasma composite cutting method. The following cutting rate (moving speed of the cutting torch) was matched for different thicknesses of the stainless steel weld overlay 3 and the carbon steel layer 2.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. A cutting method of a carbon steel and stainless steel composite material, the carbon steel and stainless steel composite material comprises a carbon steel layer and a stainless steel overlaying layer, the height of the carbon steel layer is greater than or equal to 100mm, the thickness of the stainless steel overlaying layer is greater than 10mm and less than or equal to 150mm, and the cutting method comprises the following steps: placing the carbon steel layer and the stainless steel surfacing layer along the vertical direction; arranging a flame cutting gun and a plasma cutting gun, wherein a cutting nozzle of the flame cutting gun is vertically downward, and a cutting nozzle of the plasma cutting gun is horizontally arranged and faces the stainless steel surfacing layer; and cutting the carbon steel layer by using the flame cutting gun, and cutting the stainless steel surfacing layer by using the plasma cutting gun so as to finish the cutting of the carbon steel and stainless steel composite material.
2. The cutting method according to claim 1, wherein the cutting surface of the carbon steel layer and the cutting surface of the stainless steel weld overlay are located on the same plane when cutting.
3. The cutting method according to claim 1, wherein the cutting of the carbon steel layer is performed first, and the cutting of the stainless steel overlay is performed after the cutting of the carbon steel layer is completed.
4. The cutting method according to claim 1, wherein the higher the height of the carbon steel layer is, the slower the moving speed of the flame cutting torch is; the thicker the thickness of the stainless steel weld overlay, the slower the movement rate of the plasma cutting torch.
5. The cutting method according to claim 1, wherein the distance between the cutting tip of the flame cutting torch and the carbon steel layer is 4-8 mm; the distance between the cutting nozzle of the plasma cutting gun and the stainless steel surfacing layer is 2-6 mm.
6. A cutting method of a carbon steel and stainless steel composite material, the carbon steel and stainless steel composite material comprises a carbon steel layer and a stainless steel overlaying layer, the thickness of the carbon steel layer is greater than or equal to 100mm, the thickness of the stainless steel overlaying layer is less than or equal to 10mm, and the cutting method comprises the following steps: placing the carbon steel layer and the stainless steel resurfacing welding layer along the horizontal direction, wherein the carbon steel layer is positioned above the carbon steel layer, and the stainless steel resurfacing welding layer is positioned below the carbon steel layer; arranging a flame cutting gun, so that a cutting nozzle of the flame cutting gun is vertically downward; and cutting the carbon steel layer by using the flame cutting gun, and melting the stainless steel overlaying layer by using heat generated by burning the carbon steel in flame so as to finish cutting the carbon steel and stainless steel composite material.
7. The cutting method according to claim 6, wherein the cutting surface of the carbon steel layer and the cutting surface of the stainless steel weld overlay are on the same plane when cutting.
8. The cutting method according to claim 6, wherein the flame cutting torch is moved at a slower speed when the carbon steel layer is cut to be thicker.
9. The cutting method according to claim 6, wherein the distance between the cutting tip of the flame cutting torch and the carbon steel layer is 4-8 mm.
10. The cutting method of claim 6, wherein the thicker the stainless steel weld overlay, the thicker the corresponding carbon steel layer.
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